Checking NIC Speed In Linux


At times I (we) need to check the NIC (Network Interface Card) speed on a Linux machine. Here is how to do it 🙂

[root@server ~]# ethtool eth0
Settings for eth0:
 Supported ports: [ ]
 Supported link modes:
 Supports auto-negotiation: No
 Advertised link modes: Not reported
 Advertised auto-negotiation: No
 Speed: 10000Mb/s
 Duplex: Full
 Port: Unknown! (255)
 PHYAD: 0
 Transceiver: internal
 Auto-negotiation: off
Link detected: yes
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